Machine for cutting chips for wood-pulp.



N. LOMBARD. MACHINE FOR CUTTING CHIPS FOB WOOD PULP.

APPLICATION TILED HAY 24,1910.

989,271. Paigented Apr. 11, 1911.

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APPLIOATIOI IILBD MAY 24, 1910, 989,271 Patented Apr. 11, 1911-.

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MAOHINE FOR CUTTING CHIPS FOR WOOD PULP.

APPLICATION mum mu 24,1910.

989,271. Patented Apr.11,1911.

. H: I E o 0% g o o v I 39 E o o o o O I O 3 0' so "218 @f 5m mbwsswInventor: (l /06AM & W N L-Lombardv @vmw by QmM NATHANIEL LOMBABD, 0FWINTHROP, MASSACHUSETTS.

MACHINE FOR CUTTING CHIPS FOR WOOD-PULP.

Specification of Letters Patent.

Patented Apr. 11, 1911.

Application filed May 24, 1910. Serial No. 563,449.

To all whom it may concern:

Be it known that I, NATHANIEL LoMBARn, a citizen of the United States ofAmerica, and a resident of Winthrop, in the county of Suffolk and Stateof Massachusetts, have invented certain new and useful Improvements inMachines for Cutting Chips for Wood Pulp, of which the following is aspecification.

In the manufacture of Wood pulp the usual practice is to cut logs inproper lengths and put them into a fan-like hopper in which is mounted aplurality of small steel knives revolving at a high rate of speed. Theseknives quickly separate the logs into small chips which are carried awayby means of a fan or other suction device to the digester where they arechemically treated to reduce the mass to pulp. This operation usuallymakes the chips of all lengths, some of which are very short and have nobinding effect when formed into pulp, while the knives break off smallpieces of wood and knots which have to be separated from the mass ofchips prior to their entering the digester as they will not be properlyacted upon by the chemicals to produce a suitable quality of pulp.

It has been found in practice that a very large proportion of pulp woodis wasted in this manner and the object of the present invention is toovercome this objection and utilize all of the wood and reduce the wastematerial to a minimum.

A further object of the invention is to cut the chips into lengthssubstantially the same so that when acted upon by the chemicals toproduce a pulpy mass, the lengths of the fiber bein of substantially thesame len h and unifbrm will have a binding effect that produces a verysuperior grade of paper of exceeding toughness.

To accomplish these objects the pulp wood is cut in the usual lengthsand fed into a hopper smaller at the top than at the bottom, the bottomof the hopper being above a revoluble member having a plurality ofchambers therein extending to the periphery of this revoluble member.

At the mouth of each chamber is secured a cutter blade, the cutting edgeof which is slightly beyond the periphery of the revoluble member, thiscutting edge extending transversely of the revoluble member and parallelto the grain of the wood in the hopper. Each cutter blade is providedwith a plurality of equally spaced slots in each of which is a knife thecutting edge of which extends beyond the periphery of the revolublemember a distance equal to the distance of the cutting edge of thecutter blade beyond said periphery so that as the revoluble memberrevolves these knives will cut incisions through the grain of the woodupon the periphery of the logs and the cutting edge of the succeedingcutter blade will cut from the logs chips of equal length. By cuttingthe incisions into the surface of the logs and then chipping off fromthe surface of the logs by means of the cutter blade portions thusseparated into equal lengths a superior pulp is secured which produces ahigh grade of this class of paper.

The invention consists 1n certain novel features of construction andarrangement of parts which will be readily understood by reference tothe description of the drawings and to the claims hereinafter given.

Of the drawings: Figure 1 represents an elevation of an apparatusembodying the features of the present invention. Fig. 2 represents atransverse section of the same, the cutting plane being on line 22 onFig. 1. Fig. 3 represents a sectional detail showing a portion of therevoluble member, a cutter blade thereon, and one of the knives forcutting the incisions into the surface of the logs. Fig. 4 represents ahorizontal section of the same, the cutting plane being on line 4-4 onFig. 2, and Fig. 5 represents a plan of a portion of the revolublemember showing the cutter blade and the plurality of knives in its rearedge.

Similar characters designate like parts throughout the several figuresof the drawings.

In the drawings, 10 and 11 represent two side frames connected togetherby the end frames 12 and 13. -These side frames 10 and 11 have bearings14 in which is mounted a revoluble shaft 15, to one end of which issecured a driving pulley 16. Between the frames 10 and 11 the shaft 15has mounted thereon and keyed thereto a revoluble member 17 providedwith a plurality of openended transverse chambers 18 extending to theperiphery of said revoluble member.

To the periphery of the revoluble member 17 are secured a plurality ofcutter blades 19 by means of bolts 20, one for each chamber 18, thecutting edges of said cutter blades extending slightly beyond theperiphery of said revoluble member. 19 substantially closes the openingthrough the periphery of the revoluble member communicating with thetransverse chambers 18, there being ust suflicient opening in advance ofthe cutting edge to permit the chips cut from the logs to pass into saidchambers.

Each cutter blade 19 has cut therethrough from its rear edge a pluralityof slots 21 of greater depth at the bottom than at the top in each ofwhich is mounted a knife 22, the cutting'edge 23 of which extends beyondthe periphery of the revoluble member a distance slightly in excess ofthe distance the cutting edge 24 of the cutter blade is beyond saidperiphery. The slots 21 are equally spaced from each other and thecutting edges of the knives secured therein are at right angles to thecutting edge of the blade 19.

It is obvious from .an'inspection of the drawings that when the knives22 are inserted in the slots 21 and the cutter blade 19 is secured bymeans of screws or bolts 20 to the revoluble member 17 said knives 22are locked in position and cannot be a'ccidentally displaced. Secured tothe upper part of the frame 10 and 11 is a hopper 25 the upper and lowerends of which are open. The walls 26 of said hopper parallel to theshaft 15 incline upwardly toward each other, the purpose of theseinclined walls being to resist any tendency of the cutter blades 19 fromforcing upwardly the logs contained therein and being cut'by the variouscutters and knives secured to the revoluble member as said memberrevolves in the direction of the arrow a on Fig. 2 of the drawings. Aremovable curved plate 27 is secured to the hopper 25 and the end frame13. WVhen it is desired to remove the cutter blades 19 or the knives 22,access to the revoluble member may be secured by removing this cover 27.As the member 17 revolves in the direction of the arrow a the cuttingedge 24 will shave from the under surface of the logs resting on theperiphery of the member 17 portions of the surface thereof whichportions will pass through the narrow opening 28 in advance of the blade19 and into the chamber 18. As soon as the blade 19 passes from beneatha log and has chipped therefrom a certain portion of its surface the logby the weight of those above will be forced downwardly and as the member17 continues to revolve the knives 22 will come into contact with theouter surface of the logs and cut transverse incisions therein, the nextblade 19 cutting from this surface chips of equal length, these chipsentering the chambers 18 as stated.

Opposite one end of the revoluble member 17 is a bonnet 29 whichcommunicates by means of the pipe 30 with a suction fan or blower 31driven by means of the pulley 32 and having an outlet 33, said blowerbeing of Each cutter blade any well-known construction. During theoperation of chipping the pulp wood the blower is driven at a high rateof speed sufficient to produce a suction that will draw from thechambers 18 the chips as fast as they are cut from the surface of thelogs.

advantages of the invention will be fully understood from the foregoing.

Having thus described my invention, I claim: 7

1. In a machine of the class described, the combination of an open-endedhopper; a revoluble member beneath said hopper having a plurality oftransverse chambers eX- tending therethrough from end to end and to itsperiphery; a peripheral cutter blade extending transversely of saidmember at the mouth of each chamber; and a suction member operableindependently of said revoluble member communicating with one end ofsaid chambers whereby the chips cut" from the material are drawn intosaid chambers and from one end thereof into a delivery tube 2. In amachine of the class described, the combination of an open-ended hopper;a revoluble member beneath said hopper hav ing a plurality of transversechambers extending from end to end thereof and to its periphery; aperipheral cutter blade extending transversely of said member at themouth of each chamber and having a plurality of slots extending inwardlyfrom its rear face; a knife in each slot the cutting edge of whichextends beyond the periphery of said cutter blade with its edge at rightangles thereto; and a suction device communicating with one end of saidchambers.

3. In a machine of the class described, the

combination of an open-ended hopper; a

revoluble member beneath said hopper havmg a plurality of transversechambers extending to its periphery; a peripheral cutter blade extendingtransversely of said member at the mouth of each chamber and having aplurality of slots extending inwardly from its rear face, said slotsbeing deeper at the bot-tom than at the top; a knife in each slot thebody portion of which fits said slot while its cutting edge extendsbeyond the periphery of said member and at right angles to said cutterblade; and a suction device communicating with one end of said chambers.

4. In a machine of the class described, the combination of an open-endedhopper; a revoluble member beneath said hopper having a plurality oftransverse chambers extending to its periphery; a peripheral cutterblade extending transversely of said member atthe mouth of each chamber,the cutting edge of Which extends slightly beyond the periphery of saidmember; a plurality of knives, the cutting edges of which are at rightangles to and extend slightly beyond the cutting edges of said cutterblades; and a suction member communicating With one end of saidchambers, whereby the chips cut by said blades and knives are drawnthrough said transverse chambers.

Signed by me at 4 Post Ofiice Sq., Boston, Mass, this 2d day of April,1910.

NATHANIEL LOMBARD. Witnesses EDNA C. CLEVELAND, WALTER E. LOMBARI).

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

